Laptop randomly shutting down, what's wrong?

Question

Do it yourself

Hello everyone, I need logical help. I've been struggling for 3 days now looking for a problem. The laptop started shutting down randomly. It can work for 1-2 hours and then it is cut off, or maybe it will turn off when the OS is loaded. Or if it turned on, then I noticed such a thing, with a slight load, opening a browser or starting programs is also turned off.
I ruled out all the banal reasons like: overheating (regularly cleaned the replacement of thermal pastes), power supply, battery, RAM, hard drive, wasps, by replacement. Outline nothing has changed.
By the way, I noticed one feature, turning on the laptop and opening the BIOS in it, leaving it all for a couple of days, the laptop continues to work normally. But as soon as it boots up, it starts to turn off. Didn't notice any other glitches.
Who faced this problem, give food for the brain where to dig? I sin on bridges, but doubts torment me. Help me please)

Answer 1

- Did you look in the magazines? Usually everything is written there
- Did you look at the power properties? Maybe there is a timer for inactivity.

Answer 2

bios, leaving it all for a couple of days

Some crap starts to fool after starting its driver - bridge or video.
I came across this - a person was strained with money, the laptop turned off at boot and did not turn on again until it stood without power and battery for about 10 minutes. But I worked in BIOS as much as I wanted. And when installing Windows without drivers, it also worked. In general, I reinstalled Windows, but did not put firewood either on Video or on ChipSet - the laptop works, people are happy.
Try to put XP or or 7, or boot from an old LivSD - which does not have drivers for this laptop and see. It will most likely work as well as with the BIOS at least for how long.

Answer 3

Overheating is excluded not by repair, but by temperature monitoring. Start with this.

Answer 4

Temperatures are all right, no higher than 45-50 degrees. The magazines are clean. I tried to load OS life cd with the hard drive completely turned off. With and without battery. All the same

Answer 5

As already advised above, look at the Windows event log, look at the C:\Windows\Minidump folder for files with an error record. But it is unlikely that there is anything there, when writing to these places, the computer throws out a blue screen and goes to reboot. If we exclude the influence of temperature, then the first thing I would do is check the processor power circuits on the motherboard.

Answer 6

Change the frequency synthesizer. He's probably the problem.